why spark ml package doesn't contain svm algorithm

I have found spark ml package have implement naivebayes algorithm and the source code is simple,. I am confusing why spark ml package doesn’t contain svm algorithm,it seems not very hard to do that.

spark1.4.1 extremely slow for take(1) or head() or first() or show

Dear All, I have a hive table with 100 million data and I just ran some very simple operations on this dataset like: val df = sqlContext.sql("select * from user ").toDF df.cache df.registerTempTable("tb") val b=sqlContext.sql("select